package com.situ.crm;

public class Singleton {
    private static volatile Singleton instance =  null;

    private Singleton() {}

    public static Singleton getInstance() {
        if (instance == null) {
            synchronized (Singleton.class) {
                if (instance == null) {
                    instance = new Singleton();
                }
            }
        }

        return instance;
    }

    public synchronized static Singleton getInstance1() {
        synchronized (Singleton.class) {
            if (instance == null) {
                instance = new Singleton();
            }
        }

        return instance;
    }
}
